Environment & Energy

Consider the steps in your energy system and apply basic thermodynamics.

Both batteries and hydrogen serve as energy carriers. Batteries are significantly more efficient, around 90%, while electrolysis is maybe 75% efficient, but energy stored in a battery is vastly more useful than energy stored in hydrogen for most purposes.

There may be niche applications where hydrogen makes sense, but the best use of "green" electricity is to use it directly rather than store it. if you must store the energy, pumped storage works best where available. Unless and until we have an energy system where all demand for electricity is fully met by "green" sources, any diversion to low-efficiency storage is intrinsically wasteful.

(I'm deliberately being vague about what "green" means in this context, as you may use whatever definition you please and the conclusions are the same.)